Eastman-kodak Company

Nexpress Solutions, Inc.

Hichang Yoon

Dennis E Smith

Michael T Regan

Matthew C Ezenyilimba

Todd C Zion

Dinesh Tyagi

Bret Martin Johnston

A process for the preparation of colored polymeric toner particles includes: forming an organic phase by dissolving an organic polymer and, optionally, one or more additives in a water-immiscible organic solvent; forming a dispersion by combining the organic phase with an aqueous phase comprising a particulate stabilizer, a colorant, and, optionally, a promoter, with the proviso that when the colorant is carbon black, it is an acidic carbon black having a pH less than 7; homogenizing the dispersion to form droplets containing the organic solvent, organic polymer, and colorant; removing the organic solvent from the droplets to form colored polymeric toner particles; and separating and drying the toner particles.

Process for preparing colored toner particles

A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion wherein a flocculating agent is added to the aqueous phase before or after homogenization; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.

Toner particles of controlled morphology

A method for the preparation of polymer particles comprising the steps of: a) forming an organic phase by dissolving a polymer material in a solvent; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer and homogenizing the resultant dispersion, thereby forming spherical particles having a selected particle and uniform particle size distribution; c) following the homogenizing, adding a particle shape-modifying surface active material to the spherical particles; and d) removing the solvent, thereby producing irregularly shaped polymer particles having substantially the same selected particle size and particle size distribution as that of the spherical particles.

Polymer particles of controlled shape

Growing community of inventors

Fairport, NY, United States of America

Hichang Yoon